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In Reply to: Is 7591A really in production again? (nt) posted by stefan on January 18, 2001 at 12:52:32:
I heard these are just rebased tubes from another production.
Is this true?
No, you're thinking of the old Sovtek 7591-XYZ, which was
just a rewired Sovtek 5881, and did need a circuit change
to replace a regular 7591A (needed about twice the bias voltage
for the same plate current).
The new Electro-Harmonix 7591A plugs in and biases up just like
a 7591A is supposed to, the only thing it's got in common with
a Sovtek 5881 is the bulb.
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